Question 76
The cells of a $9 \times 10$ board are coloured red, green or blue. Every $3 \times 3$ square of the board contains exactly three red cells, three green cells and three blue cells. What is the maximum possible number of red cells?
(A) 32
(B) 34
(C) 36
(D) 39
(E) 40
(A) 32
(B) 34
(C) 36
(D) 39
(E) 40